Googlemap visualization does not work when Calculation element active

Hi,
Joomla 3.8, new version of php - migrated from 5.6 to 7.2.
I have visualizations on google maps. They stopped working after the php upgrade - simply do not display anymore.
I found that if I deactivate Fabrik element - Calculation in the backend, the visualizations start displaying correctly.
Is that a bug of some kind?
Of course, I need calculation for other purposes, so it is no solution for me.
Do not ask me what these two elements have in common, I am not an expert and that is why I am writing here.
Thanks in advance for any help!

A calc element contains custom php code (created by you).
You may have used php syntax which is not longer valid in php7.2.
So check your custom code in your calc element and adapt for the new php version.

You are getting an error from PHP 7, because whatever is in gps_dane___speed is an invalid number. Either it starts with a 0 and has a digit more than 8 (PHP treats numbers starting with 0 as octal), or has some other non-numeric problem.

You could try seeing what is in that data. Put this as the first line in your calc:

Code (Text):

var_dump($data['gps_dane___speed']);exit;

... and then load the viz. That should give you an otherwise blank page with just the debug output.